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參數(shù)資料
| 型號(hào)： | LM2984 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Microprocessor Power Supply System |
| 中文描述： | 微機(jī)電源系統(tǒng) |
| 文件頁(yè)數(shù)： | 5/16頁(yè) |
| 文件大?。?/td> | 398K |
| 代理商： | LM2984 |
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Electrical Characteristics
(Continued)
V
= 14V, I
= 5 mA, I
= 5 mA, I
= 5 mA, R
= 130 k
, C
= 0.33 μF, C
mon
= 0.47 μF, unless otherwise indicated,
Boldface
type refers to limits over the entire operating temperature range, 40C
T
A
≤
+125C, all other limits are for T
A
= T
J
= 25C (Note 8)
Parameter
Conditions
Typical
Limit
(Note 4)
Units
Computer Monitor/Reset Functions
Reset Rise Time
On/Off Switch Input
Current (Pin 8)
On/Off Switch Input
Threshold Voltage
R
rst
= 10k, V
rst
= 5V, C
rst
≤
10 pF
V
ON
= 2.4V
V
ON
= 0.4V
0.60
7.5
0.01
1.22
1.22
1.00/
1.50
25/
25
10/
10
0.80/
0.80
2.00/
2.00
μs
max
μA
max
μA
max
V
min
V
max
Note 2:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating
the device beyond its specified operating ratings.
Note 3:
Thermal resistance without a heatsink for junction-to-case temperature is 3C/W. Thermal resistance case-to-ambient is 40C/W.
Note 4:
Tested Limits are guaranteed and 100% production tested.
Note 5:
Human body model, 100 pF capacitor discharged through a 1500
resistor.
Note 6:
Internal comparators detect when the main regulator output (V
) changes from the measured output voltage (with V
= 14V) by the specified amount,
V
High or
V
Low, and set the Reset Error Flag low. The Reset Error Flag is held low until V
OUT
returns to regulation. The Reset Error Flag is then allowed
to go high again after a delay set by R
t
and C
t
. (see application section).
Note 7:
This parameter is a measure of how short a pulse can be detected at the μP Monitor Input. This parameter is primarily influenced by the value of C
mon
. (See
Application Hints Section.)
Note 8:
To ensure constant junction temperature, low duty cycle pulse testing is used.
Block Diagram
DS011252-2
5
www.national.com
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